Penitration of subshells

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How does the penetrating effect of different subshells present in a shell of an atom affect the ionization energy?

so to answer this firstly we have to understand ionisation energy.

It is the energy required in kj/mol to remove an electron from the outermost shell of an isolated gaseous atom.

now the question arises of penetration , it is the property of approaching near to the nucleus.

The deeply penetrated electron means that it is near to the nucleus .

So if an electron is deeply penetrated , it means that we have to spend more energy to remove it . and thus higher will be its ionization energy.

Here are the subshells in increasing order of their penetration power

  f < d < p < s

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